Kinetic energy is the energy of motion. Any object that is moving has kinetic energy. This category of kinetic energy will be used when the energy is contained in the motion of a single object or in the motion of a group of objects that act as a single object.

Other types of energy are often classified as being a type of kinetic energy, since their energy is due to the motion, but there are more than one object involved.

Some of the most common examples of the energy of this type are:

Ball Moving Horizontally	Any single object that is moving has kinetic energy.
Wind	The wind is made up of air molecules. Even though there are many of these air molecules, energy of motion is contained in all of the molecules moving as a single mass of air.
Sound	Sound is the vibration or motion of air molecules moving back and forth. Again, these molecules act as a single mass of air.